picklescan - Unsafe Deserialization via lib2to3.pgen2.grammar.Grammar.loads

{
  "id": "6e05fb314ee48b2211eaaff53841db9f3814bdec646fefbb026f733a631dd2a1",
  "url": "https://osv.dev/vulnerability/CVE-2025-71359",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "picklescan - Unsafe Deserialization via lib2to3.pgen2.grammar.Grammar.loads",
    "summary": "picklescan before 0.0.29 fails to detect malicious pickle payloads that utilize lib2to3.pgen2.grammar.Grammar.loads in the reduce method, allowing remote code execution. Attackers can craft pickle files embedding dangerous code that evades picklescan detection and executes during pickle.load() deserialization.",
    "evidence": "osv:CVE-2025-71359",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-71359",
      "aliases": [
        "CVE-2025-71359",
        "GHSA-f54q-57x4-jg88"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mmaitre314/picklescan",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "aecd11be98702caa9ba9b12189d91ad596a36114"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.0.29"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.0.29"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.0.28",
            "v0.0.27",
            "v0.0.26",
            "v0.0.25",
            "v0.0.24",
            "v0.0.23",
            "v0.0.22",
            "v0.0.21",
            "v0.0.20",
            "v0.0.19",
            "v0.0.18",
            "v0.0.17",
            "v0.0.15",
            "v0.0.14",
            "v0.0.13",
            "v0.0.12",
            "v0.0.11",
            "v0.0.10",
            "v0.0.9",
            "v0.0.8",
            "v0.0.7",
            "v0.0.6",
            "v0.0.5",
            "v0.0.4",
            "v0.0.3",
            "v0.0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71359.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.463380616Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71359.json",
        "https://github.com/mmaitre314/picklescan/security/advisories/GHSA-f54q-57x4-jg88",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-71359",
        "https://www.vulncheck.com/advisories/picklescan-unsafe-deserialization-via-lib2to3-pgen2-grammar-grammar-loads"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-502"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71359.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-71359",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493816,
  "published_at": "2026-07-04T01:23:35.892+00:00"
}